There has been a lot of recent discussion about various uses of the PUA.
Can someone point to widespread instances of confusion and chaos right now  
over PUA usage?  I don't think there is any.
It seems to me there's a lot of effort being expended to engineer the  
regulation of something that hasn't been shown to be a problem in the  
world, or in any need of regulation.
For the most-part, it's been my impression that actual PUA usages are very  
localized and platform-specific, and the characters tend not to leak all  
over the place.  If end-users have a demonstrable need to widely  
communicate some set of characters, I would think they might first consider  
them as candidates for standardization; not as evidence that arcane  
regulatory mechanisms need to be engineered for the PUA.
Most things that most people need are already encoded.  I don't see people  
coming to this list with existing collections of entities that are not  
encoded, and yet need to be widely transmitted and stored.  (Of course, I  
am not referring to unencoded minority scripts, many of which UTC already  
knows about.)
If such collections were widespread, I'm sure UTC would like to hear about them.
        Rick
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